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Charge Separation in Intermixed Polymer:PC70BM Photovoltaic Blends: Correlating Structural and Photophysical Length Scales as a Function of Blend Composition

Hendrik Utzat, Stoichko Dimitrov Orcid Logo, Scot Wheeler, Elisa Collado-Fregoso, Pabitra Shakya Tuladhar, Bob C. Schroeder, Iain McCulloch, James Durrant Orcid Logo

The Journal of Physical Chemistry C, Volume: 121, Issue: 18, Pages: 9790 - 9801

Swansea University Authors: Stoichko Dimitrov Orcid Logo, James Durrant Orcid Logo

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DOI (Published version): 10.1021/acs.jpcc.7b02898

Abstract

A key challenge in achieving control over photocurrent generation by bulk-heterojunction organic solar cells is understanding how the morphology of the active layer impacts charge separation and in particu-lar the separation dynamics within molecularly-intermixed donor-acceptor domains versus the dy...

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Published in: The Journal of Physical Chemistry C
ISSN: 1932-7447 1932-7455
Published: 2017
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URI: https://cronfa.swan.ac.uk/Record/cronfa33171
first_indexed 2017-05-03T13:11:42Z
last_indexed 2018-02-09T05:21:52Z
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spelling 2017-07-31T13:52:07.6949687 v2 33171 2017-05-03 Charge Separation in Intermixed Polymer:PC70BM Photovoltaic Blends: Correlating Structural and Photophysical Length Scales as a Function of Blend Composition 9fc26ec1b8655cd0d66f7196a924fe14 0000-0002-1564-7080 Stoichko Dimitrov Stoichko Dimitrov true false f3dd64bc260e5c07adfa916c27dbd58a 0000-0001-8353-7345 James Durrant James Durrant true false 2017-05-03 A key challenge in achieving control over photocurrent generation by bulk-heterojunction organic solar cells is understanding how the morphology of the active layer impacts charge separation and in particu-lar the separation dynamics within molecularly-intermixed donor-acceptor domains versus the dynamics between phase-segregated domains. This paper addresses this issue by studying blends and devic-es of the amorphous silicon-indacenodithiophene polymer SiIDT-DTBT and the acceptor PC70BM. By changing the blend composition, we modulate the size and density of the pure and intermixed domains on the nanometre lengthscale. Laser spectroscopic studies show that these changes in morphology cor-relate quantitatively with the changes in charge separation dynamics on the nanosecond timescale, and with device photocurrent densities. At low fullerene compositions, where only a single, molecularly in-termixed polymer-fullerene phase is observed, photoexcitation results in a ~30% charge loss from gem-inate polaron pair recombination, which is further studied via light intensity experiments showing that the radius of the polaron pairs in the intermixed phase is 3-5 nm. At high fullerene compositions (≥ 67%), where the intermixed domains are 1-3 nm and the pure fullerene phases reach ~4 nm, the geminate recombination is suppressed by the reduction of the intermixed phase making the fullerene domains accessible for electron escape. Journal Article The Journal of Physical Chemistry C 121 18 9790 9801 1932-7447 1932-7455 31 12 2017 2017-12-31 10.1021/acs.jpcc.7b02898 COLLEGE NANME COLLEGE CODE Swansea University 2017-07-31T13:52:07.6949687 2017-05-03T11:36:44.8147738 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering Hendrik Utzat 1 Stoichko Dimitrov 0000-0002-1564-7080 2 Scot Wheeler 3 Elisa Collado-Fregoso 4 Pabitra Shakya Tuladhar 5 Bob C. Schroeder 6 Iain McCulloch 7 James Durrant 0000-0001-8353-7345 8 0033171-04052017113308.pdf utzat2017(2).pdf 2017-05-04T11:33:08.6970000 Output 3326893 application/pdf Accepted Manuscript true 2018-04-24T00:00:00.0000000 true eng
title Charge Separation in Intermixed Polymer:PC70BM Photovoltaic Blends: Correlating Structural and Photophysical Length Scales as a Function of Blend Composition
spellingShingle Charge Separation in Intermixed Polymer:PC70BM Photovoltaic Blends: Correlating Structural and Photophysical Length Scales as a Function of Blend Composition
Stoichko Dimitrov
James Durrant
title_short Charge Separation in Intermixed Polymer:PC70BM Photovoltaic Blends: Correlating Structural and Photophysical Length Scales as a Function of Blend Composition
title_full Charge Separation in Intermixed Polymer:PC70BM Photovoltaic Blends: Correlating Structural and Photophysical Length Scales as a Function of Blend Composition
title_fullStr Charge Separation in Intermixed Polymer:PC70BM Photovoltaic Blends: Correlating Structural and Photophysical Length Scales as a Function of Blend Composition
title_full_unstemmed Charge Separation in Intermixed Polymer:PC70BM Photovoltaic Blends: Correlating Structural and Photophysical Length Scales as a Function of Blend Composition
title_sort Charge Separation in Intermixed Polymer:PC70BM Photovoltaic Blends: Correlating Structural and Photophysical Length Scales as a Function of Blend Composition
author_id_str_mv 9fc26ec1b8655cd0d66f7196a924fe14
f3dd64bc260e5c07adfa916c27dbd58a
author_id_fullname_str_mv 9fc26ec1b8655cd0d66f7196a924fe14_***_Stoichko Dimitrov
f3dd64bc260e5c07adfa916c27dbd58a_***_James Durrant
author Stoichko Dimitrov
James Durrant
author2 Hendrik Utzat
Stoichko Dimitrov
Scot Wheeler
Elisa Collado-Fregoso
Pabitra Shakya Tuladhar
Bob C. Schroeder
Iain McCulloch
James Durrant
format Journal article
container_title The Journal of Physical Chemistry C
container_volume 121
container_issue 18
container_start_page 9790
publishDate 2017
institution Swansea University
issn 1932-7447
1932-7455
doi_str_mv 10.1021/acs.jpcc.7b02898
college_str Faculty of Science and Engineering
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hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Materials Science and Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Materials Science and Engineering
document_store_str 1
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description A key challenge in achieving control over photocurrent generation by bulk-heterojunction organic solar cells is understanding how the morphology of the active layer impacts charge separation and in particu-lar the separation dynamics within molecularly-intermixed donor-acceptor domains versus the dynamics between phase-segregated domains. This paper addresses this issue by studying blends and devic-es of the amorphous silicon-indacenodithiophene polymer SiIDT-DTBT and the acceptor PC70BM. By changing the blend composition, we modulate the size and density of the pure and intermixed domains on the nanometre lengthscale. Laser spectroscopic studies show that these changes in morphology cor-relate quantitatively with the changes in charge separation dynamics on the nanosecond timescale, and with device photocurrent densities. At low fullerene compositions, where only a single, molecularly in-termixed polymer-fullerene phase is observed, photoexcitation results in a ~30% charge loss from gem-inate polaron pair recombination, which is further studied via light intensity experiments showing that the radius of the polaron pairs in the intermixed phase is 3-5 nm. At high fullerene compositions (≥ 67%), where the intermixed domains are 1-3 nm and the pure fullerene phases reach ~4 nm, the geminate recombination is suppressed by the reduction of the intermixed phase making the fullerene domains accessible for electron escape.
published_date 2017-12-31T04:10:36Z
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